crank carnage-still on the lot

[87octane]

While waiting for my factory order silverstone (cause it's the fastest color) AWD to arrive, I drive around and visit all the SS's here in sunny NorCal to get my interim fix. Today's visit was in San Jose with a silver RWD SS fresh off the transporter yesterday that would have gone home with it's new owner yesterday if the crankshaft in the essentially no miles LS2 hadn't broken in half and crapped out the 3-4 rod journal in it's entirety. The service dept had the engine out already, upside down on an engine stand, pan & intake off and I took pictures. Both piston crowns were still in bores 3 & 4, broken off at the pin journals. The crank 3-4 rod journal was completely missing, along with the rods. Apparently, the thing came off the transporter and died immediately. The crank clearly failed right at the fillet radius in classic form. I thought the LS2 was a forged crank but it sure looks to my eyeball like a casting, even though I couldn't find the parting line on the counterweights. I took pictures with my lousy phone camera, the lens is dismal, so picture quality is bad. The photos are in the SS gallery under my name.

[TonyGXP]

did they advertise a forged crank? cause that looks like a casting all right.. maybe a bad casting? good thing is it happened now, brand new, boy I'm glad I leased! (just kidding!:crazy: )

[SFTBSS]

My friend works at that dealership and gave me the heads up. He said it had not even went down the road. It makes you really think at 6000rpm.

[NORCALGUY]

is this at courtesy chevrolet?

[TrailblazerSS]

While waiting for my factory order silverstone (cause it's the fastest color)
:iagree: Hehe...

[87GN]

Where are the pictures? There isn't any for 87Octane.:confused:

[SFTBSS]

is this at courtesy chevrolet?
yes it is

[NORCALGUY]

A MEmber from another forum buddy runs the dealer ill talk to him see what happened

[Envoy Fan]

http://img.photobucket.com/albums/v79/GM_Fan/Misc%20%20Photos/nopics.gif

[87octane]

I posted pics in gallery and they got yanked in a matter of hours. I can't get the little yellow picture button to take pics from my harddrive. I've PM'd the moderator, how to post pictures of parts, he hasn't gotten back to me yet. Somebody help me out here. No, I don't have a website, I have a laptop. What's the solution here?

[TonyGXP]

yanked?? You're not Mel Gibson are you? (for those of you that aren't "with it" that was a crack at the Movie Conspiracy Theory!!)

[cliffwilson]

Per the GM Powertrain website, the 6.0L (LS2) truck engine for the 2006 TrailBlazer SS has a cast nodular iron crankshaft. The
7.0L (LS7) engine has a forged 4140 steel crankshaft.

[zamar]

You might find the answer by reading J.D.Salinger's "Catcher in the Rye" :D .

But seriously they probably got yanked because they were not of "your" TB. You can sign up for an image hosing service like yahoo or photobucket and then use the insert image function and paste the link. I think..

[NORCALGUY]

VIN OF THE SILVER ONE THERE

1GNES13H862249819

[Jman423]

I posted pics in gallery and they got yanked in a matter of hours. I can't get the little yellow picture button to take pics from my harddrive. I've PM'd the moderator, how to post pictures of parts, he hasn't gotten back to me yet. Somebody help me out here. No, I don't have a website, I have a laptop. What's the solution here?
If you go to http://photobucket.com and make an account (takes about a minute), you can upload all the pictures you want and you can link to them in this thread :m2:

[Darkside]

:offtopic: Just curious, but why would you want AWD while living in Cali?

[87octane]

Thanks for the tip Jman423, I needed that. I spent some quality time at GMPowertrain.com and confirmed the cast crank in the LS2 (thanks cliffwilson for turning me on to that). Powertrain says the journals are filleted but you sure can't tell by looking at the engine. Now these pictures (and failure mode-porosity + inconsistant grain structure) make perfect sense. Seeing as the total # of LS2 cast cranks mfg'd must be in the 10k + range, and no other failures reported that I've ever seen, This is probably an acceptable .001% mfg failure rate. Makes me think twice about doubling output on a stock crank w/various power adders, though.

http://i38.photobucket.com/albums/e129/87octane/Photo_012406_001.jpg

http://i38.photobucket.com/albums/e129/87octane/Photo_012406_018.jpg

http://i38.photobucket.com/albums/e129/87octane/Photo_012406_019.jpg

http://i38.photobucket.com/albums/e129/87octane/Photo_012406_020.jpg

[Fishhunter911]

:eek: :eek: man I hate to see that!

[BIGBOS]

Ouch....:x

[NORCALGUY]

SOMEONE is going to get a killer deal on this new tbss. New motor will be noted in the service notes so many people will go away from seeing that so they are going to let it go for a nice nice price.

[turboawd]

so are they swapping the whole motor, or rebuilding it inhouse?

[beertestr]

so are they swapping the whole motor, or rebuilding it inhouse?

With all the visible damage to the block, it'd be silly to rebuild it. A replacement motor built at the engine plant instead of an open repair garage would be my choice as well.

[Fishhunter911]

With all the visible damage to the block, it'd be silly to rebuild it. A replacement motor built at the engine plant instead of an open repair garage would be my choice as well.


That would be the ONLY way I would buy it after that.

[steined]

That would be the ONLY way I would buy it after that.

Since Mallet isn't too far from the dealer I purchased my SS from, I'd let them rebuild that motor ;)

[Envoy Fan]

That would be the ONLY way I would buy it after that.

:iagree:

[BLK60SS]

Since Mallet isn't too far from the dealer I purchased my SS from, I'd let them rebuild that motor ;)

At least they'd have the common sense to put a forged crank in it. :rolleyes: